Loans, Net - Narrative (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) loan_segment loan	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan segments | loan_segment	3
Mortgages held for sale	$ 0	$ 0
Nonaccrual	8,359,000	8,784,000
Provision for loan losses	1,853,000	2,293,000	$ 1,960,000
Interest on non-accrual loans foregone	362,000	342,000	$ 544,000
Total TDR	14,400,000	15,500,000
TDR included in nonaccrual loans	2,000,000
TDR performing as agreed	12,400,000
Valuation allowance related to total TDR	$ 1,100,000	$ 1,600,000
Number of loans for lowering interest | loan	1
Number of loans for extended terms | loan	4
Number of Loans | loan	0	0
Fund Mortgage Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from held for sale loans	$ 4,300,000	$ 1,100,000
Portfolio loans	4,400,000	1,000,000
Net recovery	127,000	100,000
Nonaccrual	1,200,000	$ 1,000,000
Reserves for loan losses	$ 0
Loans Fully Written Off [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	28
Provision for loan losses	$ 339,000
Problem Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans | loan	4